Fix space-in-path game launching on Windows (#432)

src/SharpEmu.CLI/Program.cs

@@ -607,7 +607,7 @@ internal static partial class Program
             nint jobHandle = 0;
             Environment.SetEnvironmentVariable(MitigatedChildEnvironment, "1");
             var created = CreateProcessW(
-                processPath,
+                null,
                 cmdLineBuilder,
                 0,
                 0,
@@ -1433,7 +1433,7 @@ internal static partial class Program
     [DllImport("kernel32.dll", EntryPoint = "CreateProcessW", SetLastError = true, CharSet = CharSet.Unicode)]
     [return: MarshalAs(UnmanagedType.Bool)]
     private static extern bool CreateProcessW(
-        string applicationName,
+        string? applicationName,
         StringBuilder commandLine,
         nint processAttributes,
         nint threadAttributes,